Which type of fire does dry chemical extinguishing agent primarily address?

The correct choice identifies that dry chemical extinguishing agents are effective in suppressing fires classified as A, B, and C. This includes ordinary combustibles such as wood and paper (Class A), flammable liquids like gasoline or oil (Class B), and energized electrical equipment (Class C).

Dry chemical agents work by interrupting the chemical reaction that occurs during combustion, making them versatile in addressing a range of different fire types. This versatility is why dry chemical extinguishers are commonly found in many settings, offering protection against multiple hazards in a single device.

In contrast, Class D fires involve combustible metals and require specialized extinguishing agents, while electrical fires can often be addressed by the same agents effective against Class B. However, it is crucial for users to identify the specific risks present in their environments to choose the right type of extinguisher for their needs.